Title (fr)

Publication

Application

Priority

FR 9910089 A 19990730

Abstract (en)

The device for synchronisation of analogue signal comprises an analogue-to-digital converter (3) receiving an input signal (A), a register (9) receiving the output (D) of converter, a phase locked loop (5) comprising an oscillator (15) generating a number of clock signals, eg. 5 signals (CK0-CK4) phase-shifted by the same period, eg. T/4, where the first clock signal (CK0) is used for timing the register, a multiplexer (19) receiving other clock signals (CK1-CK4) and having an output used for timing the converter, and an analysis circuit (21) for the control of multiplexer as a function of successive values at the output of register. The oscillator (15) comprises a number of balanced differential amplifiers connected in an oscillator ring, where the output of an amplifier of odd rank delivers the first clock signal (CK0), and the outputs of amplifiers of even rank deliver other clock signals (CK1-CKI4). The phase locked loop (5) also contains a reference oscillator (11), a phase comparator (13), and a low-pass filter (17). The analysis circuit (21) contains a memory unit for storing successive values from the register output, and a microprocessor for an analysis of successive values in order to determine the instants of zero crossings, which are taken as reference vents, of the signal output from the register. A claim is included for a circuit comprising a number of synchronisation devices of the proposed type utilizing the same phase locked loop (5) and the same clock signals (CK0-CK4). A claim is also included for a control circuit for a laser disc reading device, where each synchronisation device receives an analogue signal from a disc reading head.